diff --git a/app/appearance/themes/daylight/theme.css b/app/appearance/themes/daylight/theme.css
index 33d4eae82..49335ba5c 100644
--- a/app/appearance/themes/daylight/theme.css
+++ b/app/appearance/themes/daylight/theme.css
@@ -180,9 +180,10 @@
     --b3-protyle-code-background: rgba(27, 31, 35, .05);
 
     /* 所见即所得行内元素颜色 */
-    --b3-protyle-inline-strong-color: #202124;
-    --b3-protyle-inline-em-color: #202124;
-    --b3-protyle-inline-s-color: #202124;
+    --b3-protyle-inline-strong-color: inherit;
+    --b3-protyle-inline-em-color: inherit;
+    --b3-protyle-inline-u-color: inherit;
+    --b3-protyle-inline-s-color: inherit;
     --b3-protyle-inline-link-color: #4285f4;
     --b3-protyle-inline-mark-background: rgb(252, 212, 126);
     --b3-protyle-inline-mark-color: #202124;
diff --git a/app/appearance/themes/midnight/theme.css b/app/appearance/themes/midnight/theme.css
index 9779a6f78..cf1260cd9 100644
--- a/app/appearance/themes/midnight/theme.css
+++ b/app/appearance/themes/midnight/theme.css
@@ -179,9 +179,10 @@
     --b3-protyle-code-background: rgba(240, 246, 252, .15);
 
     /* 所见即所得行内元素颜色 */
-    --b3-protyle-inline-strong-color: #e8eaed;
-    --b3-protyle-inline-em-color: #e8eaed;
-    --b3-protyle-inline-s-color: #e8eaed;
+    --b3-protyle-inline-strong-color: inherit;
+    --b3-protyle-inline-em-color: inherit;
+    --b3-protyle-inline-u-color: inherit;
+    --b3-protyle-inline-s-color: inherit;
     --b3-protyle-inline-link-color: #8ab4f8;
     --b3-protyle-inline-mark-background: rgba(255, 208, 0, .4);
     --b3-protyle-inline-mark-color: var(--b3-theme-on-background);
diff --git a/app/src/assets/scss/component/_typography.scss b/app/src/assets/scss/component/_typography.scss
index ffd0719d2..697b5cf1f 100644
--- a/app/src/assets/scss/component/_typography.scss
+++ b/app/src/assets/scss/component/_typography.scss
@@ -105,13 +105,11 @@
     box-shadow: inset 0 -1px 0 var(--b3-theme-surface-lighter);
   }
 
-  u {
-    text-decoration: none;
-  }
-
   u,
   span[data-type~="u"] {
+    text-decoration: none;
     border-bottom: 1px solid;
+    color: var(--b3-protyle-inline-u-color);
   }
 
   span[data-type~="inline-memo"] {